/* ==========================================================================
   David Donnell — design system
   Shared tokens, texture overlays, and signature components.
   Ported from the design system to vanilla CSS (no build step, no React).
   Used by: index.html, readiness-check.html
   ========================================================================== */

:root {
  /* --- Base navy ramp (cool, near-neutral) --- */
  --navy-950: #0d0e1a;   /* brand base / theme-color */
  --navy-925: #101120;
  --navy-900: #141524;
  --navy-850: #191a2c;
  --navy-800: #1f2136;
  --navy-750: #262842;
  --navy-700: #30324f;

  /* --- Text --- */
  --text-primary:   #f5f6fb;
  --text-secondary: #aeb3cb;
  --text-muted:     #757b98;
  --text-inverse:   #0d0e1a;

  /* --- Lines & surfaces --- */
  --border:        rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --surface-card:  #161727;
  --surface-raised:#1c1e33;

  /* --- Accents (oklch, shared L/C, hue varies) --- */
  --accent-purple: oklch(0.68 0.15 295);
  --accent-blue:   oklch(0.68 0.15 250);
  --accent-green:  oklch(0.74 0.15 158);
  --accent-purple-hex: #a78bfa;
  --accent-blue-hex:   #60a5fa;
  --accent-green-hex:  #4ade9f;
  --accent: var(--accent-blue);

  /* --- Signature gradient --- */
  --gradient-brand: linear-gradient(115deg,
    var(--accent-purple) 0%, var(--accent-blue) 48%, var(--accent-green) 100%);
  --gradient-brand-soft: linear-gradient(115deg,
    oklch(0.68 0.15 295 / 0.22), oklch(0.68 0.15 250 / 0.22), oklch(0.74 0.15 158 / 0.22));

  /* --- Type --- */
  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body:    "Instrument Sans", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --leading-tight: 1.08;
  --leading-snug:  1.28;
  --leading-normal: 1.6;
  --tracking-tight: -0.02em;
  --tracking-wide:  0.14em;

  /* --- Spacing / layout --- */
  --container: 1120px;
  --container-narrow: 760px;

  /* --- Radii --- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  /* --- Shadows --- */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 40px oklch(0.68 0.15 260 / 0.28);

  /* --- Motion --- */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur: 180ms;

  /* --- Texture --- */
  --texture-opacity: 0.055;
}

/* ==========================================================================
   Texture overlays — add .tx to a positioned container, then a .tx-* variant.
   ========================================================================== */

.tx {
  position: relative;
  isolation: isolate;
}
.tx > * { position: relative; z-index: 1; }

.tx::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--texture-opacity);
  background-repeat: repeat;
}

/* Film grain (fine noise) */
.tx-grain::after {
  background-image: url("assets/textures/grain.png");
  background-size: 160px 160px;
  mix-blend-mode: overlay;
}

/* Halftone dots */
.tx-halftone::after {
  background-image: radial-gradient(circle at center, rgba(255,255,255,0.85) 0.9px, transparent 1.2px);
  background-size: 6px 6px;
  mix-blend-mode: soft-light;
  opacity: calc(var(--texture-opacity) * 1.7);
}

/* Paper / fibrous grain (coarse noise) */
.tx-paper::after {
  background-image: url("assets/textures/paper.png");
  background-size: 300px 300px;
  mix-blend-mode: overlay;
  opacity: calc(var(--texture-opacity) * 1.4);
}

/* Dithered grit */
.tx-dither::after {
  background-image: url("assets/textures/dither.png");
  background-size: 120px 120px;
  mix-blend-mode: hard-light;
  opacity: calc(var(--texture-opacity) * 1.3);
}

/* Colored bloom that pairs with the brand gradient (hero / CTA backgrounds) */
.tx-bloom::before {
  content: "";
  position: absolute;
  inset: -25% -10% auto -10%;
  height: 65%;
  z-index: 0;
  pointer-events: none;
  background: var(--gradient-brand-soft);
  filter: blur(90px);
  opacity: 0.55;
}

/* ==========================================================================
   Type utilities
   ========================================================================== */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent-blue-hex);
}

/* Gradient-filled text — the headline accent */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ==========================================================================
   Buttons — "gradient" is the signature CTA (transparent fill, gradient border)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  line-height: 1.1;
  white-space: nowrap;
  text-decoration: none;
  transition: transform var(--dur) var(--ease),
              background var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.btn-sm { padding: 8px 16px; font-size: 0.875rem; border-radius: 10px; }
.btn-lg { padding: 16px 30px; font-size: 1.0625rem; border-radius: 14px; }

/* Signature gradient outline: gradient border via padding-box/border-box */
.btn-gradient {
  color: var(--text-primary);
  border: 1.5px solid transparent;
  background: linear-gradient(var(--navy-950), var(--navy-950)) padding-box,
              var(--gradient-brand) border-box;
}
.btn-gradient:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-primary {
  background: var(--text-primary);
  color: var(--text-inverse);
}
.btn-primary:hover { background: #ffffff; transform: translateY(-1px); }

.btn-secondary {
  background: var(--surface-raised);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}
.btn-secondary:hover { transform: translateY(-1px); border-color: var(--text-muted); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.05); color: var(--text-primary); }

/* ==========================================================================
   Badge — small mono eyebrow pill
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  line-height: 1;
}
.badge-neutral {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.badge-blue {
  background: oklch(0.68 0.15 250 / 0.16);
  color: var(--accent-blue-hex);
  border: 1px solid oklch(0.68 0.15 250 / 0.4);
}
.badge-green {
  background: oklch(0.74 0.15 158 / 0.16);
  color: var(--accent-green-hex);
  border: 1px solid oklch(0.74 0.15 158 / 0.4);
}
.badge-gradient {
  color: var(--text-primary);
  border: 1px solid transparent;
  background: linear-gradient(var(--navy-900), var(--navy-900)) padding-box,
              var(--gradient-brand) border-box;
}

/* ==========================================================================
   Card — "gradient" variant marks the featured / priced offer
   ========================================================================== */

.ds-card {
  position: relative;
  isolation: isolate;
  border-radius: var(--radius-lg);
  padding: 26px 26px 24px;
  font-family: var(--font-body);
  color: var(--text-secondary);
  background: var(--surface-card);
  border: 1px solid var(--border);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.ds-card:hover { border-color: var(--border-strong); }

.ds-card-gradient {
  border: 1.5px solid transparent;
  background: linear-gradient(var(--surface-card), var(--surface-card)) padding-box,
              var(--gradient-brand) border-box;
}

.card-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-blue-hex);
  margin-bottom: 14px;
}

.card-footer {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
  .btn:hover { transform: none; }
}